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High-manganese pre-hardened plastic die steel plate and production method thereof

A technology of plastic mold and production method, which is applied in the field of plastic mold steel, can solve problems such as increasing production costs, and achieve the effects of ensuring hardenability, good polishing performance, and reasonable chemical composition design

Inactive Publication Date: 2017-08-18
TANGSHAN IRON & STEEL GROUP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The above-mentioned processes all add precious metal alloy elements, which increase the production cost to varying degrees.

Method used

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  • High-manganese pre-hardened plastic die steel plate and production method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] Composition and production method of high manganese pre-hardened plastic mold steel plate with a thickness specification of 21 mm.

[0024] The composition and mass percentage of the high manganese pre-hardened plastic mold steel plate: C: 0.38%, Mn: 1.36%, S: 0.006%, P: 0.018%, Si: 0.34%, Al: 0.022%, Cr: 1.65%, Mo: 0.38%, the rest is iron and unavoidable impurities.

[0025] The production method of the high manganese pre-hardened plastic mold steel plate includes converter smelting, LF furnace refining, RH vacuum refining, continuous casting slab, controlled rolling and controlled cooling and high temperature tempering heat treatment process, the specific steps are as follows:

[0026] 1) Converter smelting process: The molten iron entering the converter has a sulfur content of 0.050%.

[0027] 2) Refining in LF furnace: After refining in LF furnace and RH vacuum refining, qualified molten steel is obtained. The Mn / Cr ratio is 0.824, the Si / Mo ratio is 0.89, and S: 0...

Embodiment 2

[0032] Composition and production method of high manganese pre-hardened plastic mold steel plate with a thickness specification of 41mm.

[0033] The composition and mass percentage of the high manganese pre-hardened plastic mold steel plate: C: 0.38%, Mn: 1.35%, S: 0.006%, P: 0.018%, Si: 0.34%, Al: 0.018%, Cr: 1.68%, Mo: 0.38%, the rest is iron and unavoidable impurities.

[0034] The production method of the high manganese pre-hardened plastic mold steel plate includes converter smelting, LF furnace refining, RH vacuum refining, continuous casting slab, controlled rolling and controlled cooling and high temperature tempering heat treatment process, the specific steps are as follows:

[0035] 1) Converter smelting process: The molten iron entering the converter has a sulfur content of 0.040%.

[0036] 2) Refining in LF furnace: After refining in LF furnace and RH vacuum refining, qualified molten steel is obtained. The Mn / Cr ratio is 0.80, the Si / Mo ratio is 0.89, and S: 0.0...

Embodiment 3

[0041] Composition and production method of high manganese pre-hardened plastic mold steel plate with a thickness specification of 81mm.

[0042]The composition and mass percentage of the high manganese pre-hardened plastic mold steel plate: C: 0.39%, Mn: 1.45%, S: 0.006%, P: 0.018%, Si: 0.34%, Al: 0.020%, Cr: 1.70%, Mo: 0.39%, the rest is iron and unavoidable impurities.

[0043] The production method of the high manganese pre-hardened plastic mold steel plate includes converter smelting, LF furnace refining, RH vacuum refining, continuous casting slab, controlled rolling and controlled cooling and high temperature tempering heat treatment process, the specific steps are as follows:

[0044] 1) Converter smelting process: The molten iron entering the converter has a sulfur content of 0.050%.

[0045] 2) Refining in LF furnace: After refining in LF furnace and RH vacuum refining, qualified molten steel is obtained. The Mn / Cr ratio is 0.853, the Si / Mo ratio is 0.872, and S: 0....

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Abstract

The invention discloses a high-manganese pre-hardened plastic die steel plate and a production method thereof. The steel plate comprises the following chemical components in percentage by mass: 0.32-0.40% of C, 1.30-1.80% of Mn, 0.30-0.60% of Si, S smaller than or equal to 0.015%, P smaller than or equal to 0.020%, 1.40-2.00% of Cr, 0.30-0.50% of Mo, 0.015-0.040% of Al and the balance of Fe and inevitable impurities. The production method comprises the steps of converter smelting, LF (Ladle Furnace) refining, RH (Ruhrstahl Hereaeus) vacuum refining, continuous casting sheet billet, controlled rolling and cooling and tempering. The steel plate disclosed by the invention has the advantages that the production cost is effectively reduced through the chemical component design of high manganese; and pre-hardened plastic die steel with the hardness of 28-38HRC is obtained by adopting the steps of the controlled rolling and cooling and the high-temperature tempering heat treatment. The method has the characteristics that the chemical component design is reasonable; the product performance is excellent; and the process is simple.

Description

technical field [0001] The invention belongs to the technical field of plastic mold steel, and in particular relates to a high-manganese pre-hardened plastic mold steel plate and a production method thereof. Background technique [0002] As a mold material for the manufacture of plastic and rubber products, plastic mold steel is widely used in various industries such as electronic communication equipment, household appliances, living appliances, automobiles and motorcycles. The chemical composition of SM3Cr2Mo and SM3Cr2Ni1Mo are given in the YB / T 107 Ministry of Metallurgical Plastic Die Steel Standard, which correspond to American ASTM P20 and Swedish 718 plastic mold steel respectively. Generally, it is delivered in a pre-hardened state, and the hardness is controlled between 28 and 38HRC. [0003] With the increasing size and complexity of plastic products, the requirements for the life, wear resistance, corrosion resistance and high polishability of mold steel material...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/38C22C38/22C22C38/02C22C38/04C22C38/06C22C33/04
CPCC22C38/38C22C33/04C22C38/02C22C38/04C22C38/06C22C38/22
Inventor 秦坤任树洋尹绍江王云阁李行孟庆勇安海玉王重君万焱
Owner TANGSHAN IRON & STEEL GROUP
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